Mar 5 2003
Background
Polyethetetherketone ( PEEK ) is a high performance thermoplastic with the characteristics common to this group - strong, stiff, hard, high temperature resistance, good chemical resistance and inherently low flammability and smoke emission.
Polyethetetherketone ( PEEK ) is pale amber in colour and usually semi-crystalline and opaque, except thin films are usually amorphous and transparent. Polyethetetherketone ( PEEK ) also has very good resistance to wear, dynamic fatigue and radiation, but it is difficult to process and very expensive. Filled grades, including ones designed for bearing-type applications, are also used.
Applications of Polyethetetherketone ( PEEK ) include flexible printed circuit boards (film), fibres and monofilaments, injection moulded engineering components and items used in aerospace and radiation environments.
Key Properties
The key properties of Polyetheretherketone ( PEEK ) are tabulated below.
Table 1. Key properties
Chemical Resistance |
Acids - concentrated |
Fair |
Acids - dilute |
Good |
Alcohols |
Good |
Alkalis |
Good |
Aromatic hydrocarbons |
Good |
Greases and Oils |
Good |
Halogens |
Good |
Ketones |
Good |
Electrical Properties |
Dielectric constant @ 1 MHz |
3.2-3.3 @ 50 Hz - 10 Khz |
Dielectric strength ( kv.mm-1 ) |
19 @ 50 µm |
Dissipation factor @ 1 MHz |
0.003 |
Volume resistivity ( ohmcm ) |
1015 - 1016 |
Mechanical Properties |
Coefficient of friction |
0.18 |
Elongation at break ( % ) |
50 |
Hardness - Rockwell |
M99 |
Izod impact strength ( J.m-1 ) |
85 |
Poisson’s ratio |
0.4 |
Tensile modulus ( GPa ) |
3.7 - 4.0 |
Tensile strength ( MPa ) |
70-100 |
Physical Properties |
Density ( g.cm-3 ) |
1.26 - 1.32 |
Flammability |
V-0 @ 1.5 mm |
Limiting oxygen index ( % ) |
35 |
Radiation resistance - Alpha |
Good |
Resistance to Ultra-violet |
Fair |
Water absorption - equilibrium ( % ) |
0.5 |
Water absorption - over 24 hours ( % ) |
0.1-0.3 |
Thermal Properties |
Coefficient of thermal expansion ( x10-6 K-1 ) |
47/108 |
Heat-deflection temperature - 0.45 MPa ( °C ) |
>260 |
Heat-deflection temperature - 1.8 MPa (°C ) |
160 |
Specific heat ( kJ.kg-1.K-1 ) |
0.32 |
Thermal conductivity @ 23 °C ( W.m-1.K-1 ) |
0.25 |
Upper working temperature (°C ) |
250 |
Properties Polyetheretherketone Film |
Property |
|
Value |
Density |
g.cm-3 |
1.26 - amorphous |
Dielectric Constant @ 1 MHz |
|
3.3 |
Dielectric Strength @ 25 µm thick |
KV.mm-1 |
110-150 |
Dissipation Factor @ 1 MHz |
|
0.005 |
Extension to break - Longitudinal |
% |
240 |
Extension to break - Transverse |
% |
240 |
Flammability |
VTM-1 @ 0.1 mm |
Resistencia Corona @ 20 kV mm-1 50 Hz |
g.µm-1 |
35-50 |
Permeability to Oxygen @ 25 C |
x10-13.cm3.cm.cm-2.s-1.Pa-1 |
0.06-0.1 |
Permeability to Water @ 25 C |
x10-13.cm3.cm.cm-2.s-1.Pa-1 |
160-300 |
Shrinkage |
% |
0.5 @ 150 C |
Specific Heat |
kJ.kg-1.K-1 |
1.45 |
Tensile modulus - Longitudinal |
GPa |
2.6 |
Tensile modulus - Transverse |
GPa |
2.6 |
Tensile strength - Longitudinal |
MPa |
120 |
Tensile strength - Transverse |
MPa |
120 |
Properties Polyetheretherketone Fibre |
Property |
|
Value |
Specific Tenacity |
cN/tex |
61 |
Density |
g.cm-3 |
1.30 |
Extension to break |
% |
19 |
Knot Tenacity |
cN/Tex |
36 |
Loop Tenacity |
cN/Tex |
40 |
Modulus - 10% |
GPa |
4.2 |
Modulus - 2% |
cN/Tex |
500 |
Modulus - 2% |
GPa |
6.5 |
Modulus - 5% |
GPa |
4.35 |
Shrinkage @ 180 C |
% |
1.1 |
Tensile Strength |
MPa |
790 |
Properties Polyetheretherketone Monofilament |
Property |
|
Value |
Material |
|
Type A |
Type B |
Type C |
Density |
g.cm-3 |
1.30 |
1.30 |
1.30 |
Extension to break |
% |
38 |
35 |
20 |
Knot Tenacity |
cN/Tex |
28 |
23 |
34 |
Loop Tenacity |
cN/Tex |
25 |
19 |
17 |
Modulus - 10% |
GPa |
1.85 |
2.8 |
3.4 |
Modulus - 2% |
cN/Tex |
382 |
438 |
474 |
Modulus - 2% |
GPa |
5.0 |
5.7 |
6.2 |
Modulus - 5% |
GPa |
2.7 |
3.7 |
3.9 |
Shrinkage @ 180 C |
% |
1.8 |
8.4 |
3.0 |
Tenacity |
cN/Tex |
34 |
30 |
60 |
Tensile Strength |
GPa |
0.44 |
0.39 |
0.78 |
About Goodfellow
Goodfellow supplies metals, ceramics and other materials to meet the research, development and specialist production requirements of science and industry worldwide.
Source: Goodfellow.
For more information on this source please visit Goodfellow.
|